Hello When a devices fails initialization, the xxx_attach() function may exit early, before calling pmf_device_register().
The consequence is that any attempt to put the system to sleep fail with a "Devices without power management support: ..." message. Weird things happens, and I experienced situation where some devices randomly or always fail initialization. This breaks sleeping mode. I have patches to move the pmf_device_register() earlier in xxx_attach() to workaround the problem in iwm(4) and ihidev(4) where I encounter the problem, but perhaps the problem could be worked around globaly, by not failing sleep mode if a driver did not call pmf_device_register()? Of course the lack of a registered suspend handler may miss the expectation of a system sleeping with reduced power, but on the other hand, being unable to sleep at all means even less power reduction. -- Emmanuel Dreyfus m...@netbsd.org
